Radiographic imaging apparatus and radiographic imaging system

Abstract

An image processing apparatus according to the present disclosure is a radiographic imaging apparatus that generates a moving image including a plurality of frames by repeatedly performing an accumulation period in which charges based on radiation emitted from a radiation source are accumulated and a reading period in which the accumulated charges are read. The radiographic imaging apparatus includes: an output section that outputs information for irradiation control of the radiation from the radiation source based on dose information of the emitted radiation; and an image controller that directly or indirectly determines, based on the dose information, at least one of a start timing and an end timing of the reading period in at least one of a current frame and a next frame of the current frame based on the radiation corresponding to the acquired dose information.

What is claimed is: 
     
         1 . A radiographic imaging apparatus that generates a moving image including a plurality of frames by repeatedly executing an accumulation period in which charges based on radiation emitted from a radiation source are accumulated in a plurality of radiation detection elements and a reading period in which reading of the accumulated charges is performed, the radiographic imaging apparatus comprising a hardware processor that executes:
 outputting, based on dose information of the emitted radiation, information for controlling emission of the radiation from the radiation source; and   directly or indirectly determining, based on the dose information, at least one of a start timing and an end timing of the reading period in at least one of a current frame and a next frame of the current frame based on the radiation corresponding to the acquired dose information.   
     
     
         2 . The radiographic imaging apparatus according to  claim 1 , wherein
 when the determined start timing of the reading period is later than a start timing based on a frame rate set in advance, the hardware processor immediately starts the reading at the start timing based on the frame rate, or the hardware processor starts the reading when the determined start timing of the reading period does not occur within a predetermined time.   
     
     
         3 . The radiographic imaging apparatus according to  claim 1 , wherein
 when the determined start timing of the reading period is earlier than a start timing based on a frame rate set in advance, the hardware processor starts the reading at the start timing based on the frame rate.   
     
     
         4 . The radiographic imaging apparatus according to  claim 1 , wherein:
 the plurality of radiation detection elements are arranged in a matrix; and   the hardware processor determines at least one of the start timing and the end timing of the reading for each of the plurality of radiation detection elements such that the reading is started sequentially from a radiation detection element of the plurality of radiation detection elements, the radiation detection element being arranged at an end portion of the matrix.   
     
     
         5 . The radiographic imaging apparatus according to  claim 1 , wherein
 the hardware processor determines at least one of the start timing and the end timing of the reading period based on the dose information.   
     
     
         6 . The radiographic imaging apparatus according to  claim 5 , wherein
 in the accumulation period, the hardware processor outputs, as the dose information, a dose detection value obtained by detecting the radiation emitted to the radiographic imaging apparatus, based on a detection value of at least one of the plurality of radiation detection elements.   
     
     
         7 . The radiographic imaging apparatus according to  claim 6 , wherein
 the hardware processor determines at least one of the start timing and the end timing of the reading period based on a reference timing at which the dose detection value changes from a value equal to or smaller than a predetermined first threshold value to a value equal to or larger than the first threshold value.   
     
     
         8 . The radiographic imaging apparatus according to  claim 7 , wherein
 the hardware processor generates the dose detection value by sampling the detection value of the radiation at two or more different times within the accumulation period.   
     
     
         9 . The radiographic imaging apparatus according to  claim 8 , wherein
 the hardware processor changes a cycle of the sampling of the detection value based on a predetermined second threshold value set in advance.   
     
     
         10 . The radiographic imaging apparatus according to  claim 9 , wherein the first threshold value and the second threshold value are different from each other. 
     
     
         11 . The radiographic imaging apparatus according to  claim 6 , wherein
 the hardware processor determines at least one of the start timing and the end timing of the reading period based on an end timing of a reading period of a frame immediately before the current frame, a start timing of correction value acquisition in the current frame, or a start timing or an end timing of an accumulation period before or after the reading period in the current frame.   
     
     
         12 . The radiographic imaging apparatus according to  claim 5 , wherein
 based on imaging condition set in advance, the hardware processor sets a method to be used from the following:
 a first determination method of determining, based on the dose detection value, at least one of the start timing and the end timing of the reading period in at least one of the current frame and the next frame, or 
 a second determination method of determining, based on a timing device mounted in the radiographic imaging apparatus, a start timing or an end timing of at least one of the reading period and the accumulation period. 
   
     
     
         13 . The radiographic imaging apparatus according to  claim 12 , wherein
 the imaging condition is a dose per unit time set in the radiation source.   
     
     
         14 . The radiographic imaging apparatus according to  claim 13 , wherein
 when the hardware processor determines to use the second determination method, the hardware processor provides notification of a time available for imaging the moving image using the second determination method.   
     
     
         15 . The radiographic imaging apparatus according to  claim 14 , further comprising:
 an operator that receives a change in at least one of a frame rate or the dose per unit time, wherein   the hardware processor provides the notification of the time available for imaging corresponding to at least one of the frame rate and the dose per unit time changed in the operator.   
     
     
         16 . The radiographic imaging system, comprising:
 a radiographic imaging apparatus including a plurality of radiation detection elements;   the radiographic imaging apparatus according to  claim 1 ; and   a radiation source that starts or ends emission of the radiation based on automatic exposure control.